Filtering apparatus



Feb. 23 i926'. A

- H. s. COE

FI'LTERING APPARATUS 2 shuts-shut -1 Filed Jan. 26. 1920 INI/ENTOR. H Coz;

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M v TTORNE Y.

Feb. 2a, 192e. 1,574,551

H. S. COE

FI LTERI NG AP PARAvTUS Filed Jan. 2e. 1920 2 shuts-suur z,

patented Feb., 23,1926@ y risiugssr PATENT carica@ naiamson s. con, or MoUnD CITY, KANSAS, assrenon, BY ii/:ESNE ASSIGNMENTS, 'ro

TEE CYCLE COMPANY, lOFCOLQIRJADO COLORADO.

FILTERXNG APPARATUS.

SPRINGS, commune, A CoRPoRATroN 0F 'Application inea aannames, v1.920.l serial No. 354,177.'

To all whom t may concern:

Be it known that I, HARRrsoNS. Con, a citizen of the United States, residing at Mound City, in the county of Linn and State oflansas, have invented certain new' and useful Improvements in Filtering Apparatus, ofwhich the followingis a specification.' v f' This vinventionrelates to filtering apparatus ofthe class .in which the filtration of mixtures'of solids'and liquids such as the dirty waters obtained in the performance ef metallurgical and chemical processes, 1s

accomplished through :f the medium of a granularl ilterbedthrough which the .liquid percolates, and means which automatically 'remove the fouled upper strata of the filter bed together with the solid residue of the material under treatment. which settles-on the Surface ofthe same.

An illustrativefembodiment of a vfilter of -this lcharacter has( been shown and describedv in my application for patent, SerialNumber 317,237, filed August 13,1920, andI it is the i 'primary object of the present invention to provide in a filtering apparatus fof the type above referred to certain modifications and improvements in the construction and arrangement whichv serv e to vincrease its eliiciency and facilitate its operation. X In the accompanying twosheets of drawings in the Several views of which likeparts are similarly designated, y i

Figure '1 is a`vertical section through a filtering apparatus of the't'ype referred to, in which the'iiproved features of construction are embodied; y

Figurey 2, a section on vthe line 2 2, Figure l drawn'to areduced scale;` Figure 3, a similarly reduced section taken' on the line 3-'-3, Figure l, and

Figure 4 a fragmentary perspective view of onejof vthe scraperblades of the-apparatus showing Vthel removable lcutting strips at the *lower ends thereof.

Referring to the drawings, the reference character-2 Vdesignates a preferably 'cylinable to permit of the percolation'V of the liquid in a mixture of liquid and solids fed onto the upper" surfaceof the same;

A lresidue-discharge conduit extends through central openings in the partition 3 andi the .'bottom, of the tank, to which it is connectedby water-tight joints, and it connccts at its lower end with the funnel-shaped i mouth 6 o f a pipe v7 of reduced diameter a valve 72t on thepipe 7 is provided to restrict the outflow of material in liquid fromthe tank'and regulate it according Lto different conditions.

The residue of the material remaining on the surface of the filter bed, is removed into the discharge-conduit together with the fouled upper.A strata ofthe bed, by the operation of a scraping element 8 and atherewith connected well Q'Whicli telescopes into the conduit. 5 and extends tothe surface of the filtering substance. v i

The scraping element consists of a series of curved blades 10 assembled'on-a bar 12 which is'suspended from av cross-bar 13 on i an upright shaft 14 which extends centrally into the tank, and is supported 4for rotation in bearings 15 and 16 on a superstructure 17 of suitable design.

The? cross-bar 13 from which the scraper assemblage is suspended is rigidly connected with the shaft through the medium of a- .ilanged collar 18, and rollers 19 mounted at in the bar of the scraper element to impart thereto a.v rotary motion while permitting 'of its independent downward movement.'

The scraper blades which extend to the surface of the Afilter bed are placed at different distances from the center of the tank and their length decreases toward the periph ery of the sani-e so that their scraping action upon the surface of-the granular filtering substance produces a sink which lgreatly facilitates and eXpedites the. movement of the lcosened matter, to the central well'9 which is rigidly attached to thefscrapers `of the series nearest the center of the tank.

AThe scraper. blades have at their lower ends L a continuously outward movement of the teetivecasings for the lower portions of the same.

The scraping element is movably suspended from the cross-bar on the shaft through the medium of two feed-screws 21 which are mounted for rotation in bearings on said bar and fitted in nuts 22 on the bar 12 to which the Scrapers are attached.

The nuts are preferably placed at the upper ends of tubular'hangers 23l which are rigidly secured to the bar of the scraping device and which in practise serve as proscrews. v

A worm-wheel 24' mounted on the shaft between its bearings,'meshes with a worm 25 `on a driving shaft to vimpart a slow rotary movement tothe scraping device over the upper surface of the filter bed.

The feed screws on the'transverse bar of `the shaft are during said movement intermittently rotated for the urpose of lowering the scraper element in t 1eA tank and they are to this end provided with toothed wheels 26 which cooperate withone or more detents 27 relatively fixed on the structurel of the apparatus on which the shaft is'mounted. The material to be filtered is fed into the tank by a conduit 28 the flow being autmatically regulated by a valvev 30 which through the medium ofv a lever 31 is connected with a float 32 on the surface of the ii uid in the tank.

aving thus described the mechanical construction. of my improved filtering apparatus, its operation, briefiy stated, is as follows:

The mixture of liquids and solids fed into Lthe tank through the feed conduit is distributed over the surface of the granular filter bed which retains thel solid constituents of the material while the liquid percolatesv into the space beneath the perforatedpartition 3, from which it is discharged through a pipe 33.

I--desire it understood that theioperationmay be expedited by connecting the space in the bottom portion ofthe tankjwith a suitable suction-deviceto induce a partial vacuum beneath the filterlbed. l

Vhile the liquid in the material percolates through the permeable substance the upper portion thereof together with the settled residue are skimmed into the central well by `the rotating scraping element which is lowered at' regular intervals through the. automatic action ofthe feeding' mechanism downwardly from to maintain its operative position with relation -to the gradually subsiding surface of the filter be After the filtering material has been exhausted the scraping element is raised by 7 reverse .rotation of the feed screws which to this end are squared at their upper ends for the application of a correspondingly socketed crank, .and the tank is refilled with the granular substance to its original depth. The float valve controlling the flow through the feed conduit regulates the'inflow of freshmaterial according to thel rate at which the liquid percolates through the filter bed and the rotating stirring blade at the end of the shaft keeps the solid matter from clogging the conduits through which it passes to the point of discharge.

The method of supporting the scraping clement at the periphery of the tank prevents vertical vibration and lateral displacement vso that a film. of even thickness is skimmed off the filter bed together with the residuent solids which settled thereon. Having thus described my invention what Iclaim is: l. In filtering apparatus of the character described, the combination of a tank, a filterbed therein, having a passage extending downwardly from its surface, .and mecha- 'nism for moving the upper strata of the filter bed to said passage; comprising a ro-v tary shaft mounted against longitudinal displacement, a scraping device connected for rotation with the shaft, and free therefrom for independent downward motion, and means to effect an intermittent downward movement of the device during rotation of the shaft.

2. Infiltering, apparatus of the character described, the combination of a tank, a filterbedtherein, having apassage extending downwardly from its surface, and mechanism for moving the upper strata of the filter bed to said passage,fcomprising a rotary shaft mounted against longitudinal displacement, a scraping Idevice connected for rotation with the shaft, and free therefrom for independent downward motion, a feed screw carried by the shaft, a nut on the 11 5 I scraping devicecooperating therewith, and

lmeans for the rotation, of the feed screw by the rotary movement of the shaft.

3. In filtering apparatus of the character described, the combination of a tank, a filter- 12.0 bed therein, having a passage extending its surface, -and mechanism for moving the upper strat-a of the filter bed to said passage, comprising a rotary shaft mounted against longitudinal displacement, a scraping device connected for rotation withthe shaft, and free therefrom for independentfdownward motion, a feedscrew carried by the shaft, a nut on the scraping1devicecooperating therewith, and 130 vrotation with the shaft, and free therefrom filter bed to said passage, comprising a ro-L tary shaft mountedA against longitudinal displacement, a scraping device'connjected for for independent downward motion, 4a feedscrew carried by the shaft, a nut on the scraping device, cooperating therewith, a toothed wheel onthe feed sc rew, and a rela- -tively fixed detent adapted to engagesaid wheel during rotation ofthe shaft.

5. Infiltering apparatus of the "character ydescribed,'the combination of a tank, a filterbed therein, having al passage extending downwardly from its surface, and mecha- Cal nism for moving the upper strata ofthe' filter bed to said passage, comprising arotary shaft mounted against longitudinal displacement, a scraping device conected for rotation with the shaft and free l'therefromvfor independent downward motion,-a crossbar on the shaft, feed screws on the-cross bar, nuts on the scraping-device cooperating withsaidcsc'rews, and means for the rotation of the screws by the rotary movement of the shaft.

6. In filtering apparatus of the character described, the combination of a tank,4 afilterbed therein, `having apassage extending `downwardly from its surface, and mechanism formoving the-upper strata of the filter bed tosaid passage, comprising a rotary shaft mounted'against longitudinal displacement, a scraping device connected for rotation with the shaft, and free therefrom for independent downward motion, feedscrews c-arried by the shaft, tubular hangers on the scraping device having nuts cooperating with the screws, and means for the rotation of the screws bythe rotary movement of the shaft.

7. In filtering lapparatus of the character described, `the combination of a tank, a per-, meablefiltering substance therein," a rotary shaft mounted against A longitudinal displacement, a. scraping device adapted to remove the upper strata of the filtering substance, said device being connected for rotation with the shaft and free therefrom for independent downward motion1 andawell, extending through the filtering substance, in connection with the scraping device.

8. In filtering apparatus of the character described, the combination of a tank, a pern'ieable lfiltering substance therein, a discharge conduit extending from the bottom r of the tank, a downwardly movable well downwardly extending through the filtering substance into saidcondult, and a scraping device connected to move with the well and adapt-l ed to remove the-upper.l strata of .the filteringvsubstance to the mouth thereof. j

9. In filtering' apparatusI of the chaacter -a scrapingfdevice connected tomove with the well and adapted to remove the upper strata of the filtering substance-to the mouthy thereof'.

4\10. In filtefingapparatus ofthe character described, the combination of a tank, a

permeable filteriiig substance therein, a discharge conduit at the vbottom of the tank; a movable `well extending throughv the filtering substance into the conduit, a scraper movablewith the welh0 a rotary shaft operatively connected with described, the combination of a. tank, a persol the well and the scraper, and astirring yblade on the shaft within the conduit.

11. A filter comprising a tank, a filter` bed therein having a' passage opening in its upper surface, a circular track, a frame 'supported on the track to move about a verticalaxis central of said passage, a scraping element downwardly intermittently 'movably suspended from the frame and engaging the surface of the bed to move the upper stratum thereof to the mouth of the passage by its rotation with the frame, and means actuated by the rotation of the scraper element for producing said downward -movement thereof. f

12. A filter comprising a tank, a filter bed' therein having a'central passage opening in the upper surface thereof, a rotary shaft co-axial with said passage, a frame .connected to thetshaft and supported for rotation with the same, a scraping-element downwardly intermittently movably suspended from the frame and engaging the surface of the bed toinove the upper stratum thereof to the mouth of the passage by its movement with the frame` and means actuated by the rotation of the scraper element thereof.

13.` A filter comprising co-axial with said passage, a frame coution with the same, and a scraping-element downwardly 'intermittently movablyl susa tank, a filter bed therein having a central passage opening in the upper surface thereof, a rotary 'shaft' 'ment for producing said downward move` 'nected .to the shaft and supported for rotapended from the frame and guided by the shaft, said element engaging the surface of 'the bed to move the' upper stratum thereof to the-mouth of the passage by its movement with the frame, Aand means actuated i tary motion with the shaft.

by the rotation of the scraper element for producing said downward movement thereof.

14. A filter comprising a tank, a filter bed therein having a passage opening in its -upper surface, a rotary shaft co-axial with said passage and immovably in the direction of its length, a downwardly movable scrapereleinentmounted to rotate with the shaft and engaging with the surface of the bed to movethe upper stratum thereof to the mouth of the passage, and means to'effect an intermittently downward movement of the scraper-element during and, by its ro- 15. In a. filtering apparatus, the combination of a tank, a filter-bed therein having a passage extendin downwardly from the surace, means inclu ing a shaft for moving the upper strataJ of the filter-bed to' said passage, and automatic means for intermittently lowering the former means as the surface of the filter-bed subsides, said automatic means being intermittently operated by the continuous rotation of the shaft.

1 6. In a -filtering apparatus, the combination of a tank, a filter-bed therein having a passage extendingdownwardly from the surface, scraper-means vcomprising a series of scraper blades, 'at different distances from the center of the tank and of decreasing height towards the periphery of the tank.

and automatic intermittent means for lowermg the scraper-means as the surface of the filter-bed subsides.

In testimony whereof I have aixed my. 

